Mormon History, Feb 17, 1847

Brigham Young, President of the Quorum of the Twelve Apostles, has a vision at Council Bluffs, Iowa, in which the martyred prophet, Joseph Smith, asks him to tell the Saints to "keep the Spirit of the Lord and it will lead them right. Be careful and not turn away the small still voice; it will teach them what to do and where to go; it will yield the fruits of the kingdom" (Andrus, Doctrinal Commentary on the Pearl of Great Price, 122).